Remove bogus usage of TREE_ADDRESSABLE in tree.h

[Eric Botcazou]

This reads:

   In a FIELD_DECL node, it means that the programmer is permitted to
   construct the address of this field.  This is used for aliasing
   purposes: see record_component_aliases.

That's bogus, the above description is that of DECL_NONADDRESSABLE_P (or 
rather that of its opposite).  There is no reference to TREE_ADDRESSABLE in 
record_component_aliases.  Moreover mark_addressable is explicit:

void
mark_addressable (tree x)
{
  while (handled_component_p (x))
    x = TREE_OPERAND (x, 0);
  if (TREE_CODE (x) != VAR_DECL
      && TREE_CODE (x) != PARM_DECL
      && TREE_CODE (x) != RESULT_DECL)
    return ;
  TREE_ADDRESSABLE (x) = 1;
}

Applied on the mainline as obvious.


2010-05-14  Eric Botcazou  <ebotcazou@adacore.com>

	* tree.h (TREE_ADDRESSABLE): Remove bogus usage for FIELD_DECL.


-- 
Eric Botcazou
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